How To Fix S#356 - Only enter systems defined as "trusted systems"

SAP Error Message - Details

• Message type: E = Error

• Message class: S# -

• Message number: 356

• Message text: Only enter systems defined as "trusted systems"

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message S#356 - Only enter systems defined as "trusted systems" ?

  The SAP error message S#356, which states "Only enter systems defined as 'trusted systems'," typically occurs when you are trying to configure a trusted RFC (Remote Function Call) connection between SAP systems, but the system you are trying to connect to is not recognized as a trusted system in the configuration.
  Cause:
  
  Missing Configuration: The target system has not been defined as a trusted system in the source system's configuration.
  Incorrect System Entry: The system you are trying to connect to may not be correctly entered in the trusted systems list.
  Authorization Issues: The user may not have the necessary authorizations to create or modify trusted system entries.
  
  Solution:
  To resolve this error, follow these steps:
  
  
  Define Trusted System:
  
  Go to transaction SM59 (RFC Destinations).
  Select the appropriate RFC destination that you are trying to configure.
  Check the settings and ensure that the target system is defined as a trusted system.
  If it is not defined, you need to add it as a trusted system.
  
  
  
  Add Trusted System:
  
  In the source system, navigate to transaction SM59.
  Select the "Trusted Systems" tab.
  Click on "Add" to enter the details of the target system.
  Enter the necessary information, including the system ID (SID), client, and other relevant details.
  Save your changes.
  
  
  
  Check Authorizations:
  
  Ensure that the user performing these actions has the necessary authorizations to create or modify trusted system entries. You may need to consult with your SAP Basis administrator if you lack the required permissions.
  
  
  
  Check Network Connectivity:
  
  Ensure that there are no network issues preventing the systems from communicating with each other.
  
  
  
  Review Documentation:
  
  Consult the SAP documentation or help resources for more detailed instructions on configuring trusted RFC connections.
  
  
  
  Related Information:
  
  Trusted RFC Connections: These are used to allow secure communication between SAP systems without requiring user credentials for each call.
  Security Considerations: Ensure that only trusted systems are configured to prevent unauthorized access and maintain system security.
  SAP Notes: Check for any relevant SAP Notes that may provide additional guidance or updates related to this error message.
  
  By following these steps, you should be able to resolve the S#356 error and successfully configure the trusted RFC connection between your SAP systems.